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path: root/init/main.c (plain)
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1/*
2 * linux/init/main.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * GK 2/5/95 - Changed to support mounting root fs via NFS
7 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
8 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
9 * Simplified starting of init: Michael A. Griffith <grif@acm.org>
10 */
11
12#define DEBUG /* Enable initcall_debug */
13
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/proc_fs.h>
17#include <linux/kernel.h>
18#include <linux/syscalls.h>
19#include <linux/stackprotector.h>
20#include <linux/string.h>
21#include <linux/ctype.h>
22#include <linux/delay.h>
23#include <linux/ioport.h>
24#include <linux/init.h>
25#include <linux/initrd.h>
26#include <linux/bootmem.h>
27#include <linux/acpi.h>
28#include <linux/tty.h>
29#include <linux/percpu.h>
30#include <linux/kmod.h>
31#include <linux/vmalloc.h>
32#include <linux/kernel_stat.h>
33#include <linux/start_kernel.h>
34#include <linux/security.h>
35#include <linux/smp.h>
36#include <linux/profile.h>
37#include <linux/rcupdate.h>
38#include <linux/moduleparam.h>
39#include <linux/kallsyms.h>
40#include <linux/writeback.h>
41#include <linux/cpu.h>
42#include <linux/cpuset.h>
43#include <linux/cgroup.h>
44#include <linux/efi.h>
45#include <linux/tick.h>
46#include <linux/interrupt.h>
47#include <linux/taskstats_kern.h>
48#include <linux/delayacct.h>
49#include <linux/unistd.h>
50#include <linux/rmap.h>
51#include <linux/mempolicy.h>
52#include <linux/key.h>
53#include <linux/buffer_head.h>
54#include <linux/page_ext.h>
55#include <linux/debug_locks.h>
56#include <linux/debugobjects.h>
57#include <linux/lockdep.h>
58#include <linux/kmemleak.h>
59#include <linux/pid_namespace.h>
60#include <linux/device.h>
61#include <linux/kthread.h>
62#include <linux/sched.h>
63#include <linux/signal.h>
64#include <linux/idr.h>
65#include <linux/kgdb.h>
66#include <linux/ftrace.h>
67#include <linux/async.h>
68#include <linux/kmemcheck.h>
69#include <linux/sfi.h>
70#include <linux/shmem_fs.h>
71#include <linux/slab.h>
72#include <linux/perf_event.h>
73#include <linux/ptrace.h>
74#include <linux/blkdev.h>
75#include <linux/elevator.h>
76#include <linux/sched_clock.h>
77#include <linux/context_tracking.h>
78#include <linux/random.h>
79#include <linux/list.h>
80#include <linux/integrity.h>
81#include <linux/proc_ns.h>
82#include <linux/io.h>
83#include <linux/kaiser.h>
84#include <linux/cache.h>
85#ifdef CONFIG_AMLOGIC_PAGE_TRACE
86#include <linux/amlogic/page_trace.h>
87#endif
88
89#include <asm/io.h>
90#include <asm/bugs.h>
91#include <asm/setup.h>
92#include <asm/sections.h>
93#include <asm/cacheflush.h>
94
95static int kernel_init(void *);
96
97extern void init_IRQ(void);
98extern void fork_init(void);
99extern void radix_tree_init(void);
100
101/*
102 * Debug helper: via this flag we know that we are in 'early bootup code'
103 * where only the boot processor is running with IRQ disabled. This means
104 * two things - IRQ must not be enabled before the flag is cleared and some
105 * operations which are not allowed with IRQ disabled are allowed while the
106 * flag is set.
107 */
108bool early_boot_irqs_disabled __read_mostly;
109
110enum system_states system_state __read_mostly;
111EXPORT_SYMBOL(system_state);
112
113/*
114 * Boot command-line arguments
115 */
116#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
117#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
118
119extern void time_init(void);
120/* Default late time init is NULL. archs can override this later. */
121void (*__initdata late_time_init)(void);
122
123/* Untouched command line saved by arch-specific code. */
124char __initdata boot_command_line[COMMAND_LINE_SIZE];
125/* Untouched saved command line (eg. for /proc) */
126char *saved_command_line;
127/* Command line for parameter parsing */
128static char *static_command_line;
129/* Command line for per-initcall parameter parsing */
130static char *initcall_command_line;
131
132static char *execute_command;
133static char *ramdisk_execute_command;
134
135/*
136 * Used to generate warnings if static_key manipulation functions are used
137 * before jump_label_init is called.
138 */
139bool static_key_initialized __read_mostly;
140EXPORT_SYMBOL_GPL(static_key_initialized);
141
142/*
143 * If set, this is an indication to the drivers that reset the underlying
144 * device before going ahead with the initialization otherwise driver might
145 * rely on the BIOS and skip the reset operation.
146 *
147 * This is useful if kernel is booting in an unreliable environment.
148 * For ex. kdump situation where previous kernel has crashed, BIOS has been
149 * skipped and devices will be in unknown state.
150 */
151unsigned int reset_devices;
152EXPORT_SYMBOL(reset_devices);
153
154static int __init set_reset_devices(char *str)
155{
156 reset_devices = 1;
157 return 1;
158}
159
160__setup("reset_devices", set_reset_devices);
161
162static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
163const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
164static const char *panic_later, *panic_param;
165
166extern const struct obs_kernel_param __setup_start[], __setup_end[];
167
168static bool __init obsolete_checksetup(char *line)
169{
170 const struct obs_kernel_param *p;
171 bool had_early_param = false;
172
173 p = __setup_start;
174 do {
175 int n = strlen(p->str);
176 if (parameqn(line, p->str, n)) {
177 if (p->early) {
178 /* Already done in parse_early_param?
179 * (Needs exact match on param part).
180 * Keep iterating, as we can have early
181 * params and __setups of same names 8( */
182 if (line[n] == '\0' || line[n] == '=')
183 had_early_param = true;
184 } else if (!p->setup_func) {
185 pr_warn("Parameter %s is obsolete, ignored\n",
186 p->str);
187 return true;
188 } else if (p->setup_func(line + n))
189 return true;
190 }
191 p++;
192 } while (p < __setup_end);
193
194 return had_early_param;
195}
196
197/*
198 * This should be approx 2 Bo*oMips to start (note initial shift), and will
199 * still work even if initially too large, it will just take slightly longer
200 */
201unsigned long loops_per_jiffy = (1<<12);
202EXPORT_SYMBOL(loops_per_jiffy);
203
204static int __init debug_kernel(char *str)
205{
206 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
207 return 0;
208}
209
210static int __init quiet_kernel(char *str)
211{
212 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
213 return 0;
214}
215
216early_param("debug", debug_kernel);
217early_param("quiet", quiet_kernel);
218
219static int __init loglevel(char *str)
220{
221 int newlevel;
222
223 /*
224 * Only update loglevel value when a correct setting was passed,
225 * to prevent blind crashes (when loglevel being set to 0) that
226 * are quite hard to debug
227 */
228 if (get_option(&str, &newlevel)) {
229 console_loglevel = newlevel;
230 return 0;
231 }
232
233 return -EINVAL;
234}
235
236early_param("loglevel", loglevel);
237
238/* Change NUL term back to "=", to make "param" the whole string. */
239static int __init repair_env_string(char *param, char *val,
240 const char *unused, void *arg)
241{
242 if (val) {
243 /* param=val or param="val"? */
244 if (val == param+strlen(param)+1)
245 val[-1] = '=';
246 else if (val == param+strlen(param)+2) {
247 val[-2] = '=';
248 memmove(val-1, val, strlen(val)+1);
249 val--;
250 } else
251 BUG();
252 }
253 return 0;
254}
255
256/* Anything after -- gets handed straight to init. */
257static int __init set_init_arg(char *param, char *val,
258 const char *unused, void *arg)
259{
260 unsigned int i;
261
262 if (panic_later)
263 return 0;
264
265 repair_env_string(param, val, unused, NULL);
266
267 for (i = 0; argv_init[i]; i++) {
268 if (i == MAX_INIT_ARGS) {
269 panic_later = "init";
270 panic_param = param;
271 return 0;
272 }
273 }
274 argv_init[i] = param;
275 return 0;
276}
277
278/*
279 * Unknown boot options get handed to init, unless they look like
280 * unused parameters (modprobe will find them in /proc/cmdline).
281 */
282static int __init unknown_bootoption(char *param, char *val,
283 const char *unused, void *arg)
284{
285 repair_env_string(param, val, unused, NULL);
286
287 /* Handle obsolete-style parameters */
288 if (obsolete_checksetup(param))
289 return 0;
290
291 /* Unused module parameter. */
292 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
293 return 0;
294
295 if (panic_later)
296 return 0;
297
298 if (val) {
299 /* Environment option */
300 unsigned int i;
301 for (i = 0; envp_init[i]; i++) {
302 if (i == MAX_INIT_ENVS) {
303 panic_later = "env";
304 panic_param = param;
305 }
306 if (!strncmp(param, envp_init[i], val - param))
307 break;
308 }
309 envp_init[i] = param;
310 } else {
311 /* Command line option */
312 unsigned int i;
313 for (i = 0; argv_init[i]; i++) {
314 if (i == MAX_INIT_ARGS) {
315 panic_later = "init";
316 panic_param = param;
317 }
318 }
319 argv_init[i] = param;
320 }
321 return 0;
322}
323
324static int __init init_setup(char *str)
325{
326 unsigned int i;
327
328 execute_command = str;
329 /*
330 * In case LILO is going to boot us with default command line,
331 * it prepends "auto" before the whole cmdline which makes
332 * the shell think it should execute a script with such name.
333 * So we ignore all arguments entered _before_ init=... [MJ]
334 */
335 for (i = 1; i < MAX_INIT_ARGS; i++)
336 argv_init[i] = NULL;
337 return 1;
338}
339__setup("init=", init_setup);
340
341static int __init rdinit_setup(char *str)
342{
343 unsigned int i;
344
345 ramdisk_execute_command = str;
346 /* See "auto" comment in init_setup */
347 for (i = 1; i < MAX_INIT_ARGS; i++)
348 argv_init[i] = NULL;
349 return 1;
350}
351__setup("rdinit=", rdinit_setup);
352
353#ifndef CONFIG_SMP
354static const unsigned int setup_max_cpus = NR_CPUS;
355static inline void setup_nr_cpu_ids(void) { }
356static inline void smp_prepare_cpus(unsigned int maxcpus) { }
357#endif
358
359/*
360 * We need to store the untouched command line for future reference.
361 * We also need to store the touched command line since the parameter
362 * parsing is performed in place, and we should allow a component to
363 * store reference of name/value for future reference.
364 */
365static void __init setup_command_line(char *command_line)
366{
367 saved_command_line =
368 memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
369 initcall_command_line =
370 memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
371 static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0);
372 strcpy(saved_command_line, boot_command_line);
373 strcpy(static_command_line, command_line);
374}
375
376/*
377 * We need to finalize in a non-__init function or else race conditions
378 * between the root thread and the init thread may cause start_kernel to
379 * be reaped by free_initmem before the root thread has proceeded to
380 * cpu_idle.
381 *
382 * gcc-3.4 accidentally inlines this function, so use noinline.
383 */
384
385static __initdata DECLARE_COMPLETION(kthreadd_done);
386
387static noinline void __ref rest_init(void)
388{
389 int pid;
390
391 rcu_scheduler_starting();
392 /*
393 * We need to spawn init first so that it obtains pid 1, however
394 * the init task will end up wanting to create kthreads, which, if
395 * we schedule it before we create kthreadd, will OOPS.
396 */
397 kernel_thread(kernel_init, NULL, CLONE_FS);
398 numa_default_policy();
399 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
400 rcu_read_lock();
401 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
402 rcu_read_unlock();
403 complete(&kthreadd_done);
404
405 /*
406 * The boot idle thread must execute schedule()
407 * at least once to get things moving:
408 */
409 init_idle_bootup_task(current);
410 schedule_preempt_disabled();
411 /* Call into cpu_idle with preempt disabled */
412 cpu_startup_entry(CPUHP_ONLINE);
413}
414
415/* Check for early params. */
416static int __init do_early_param(char *param, char *val,
417 const char *unused, void *arg)
418{
419 const struct obs_kernel_param *p;
420
421 for (p = __setup_start; p < __setup_end; p++) {
422 if ((p->early && parameq(param, p->str)) ||
423 (strcmp(param, "console") == 0 &&
424 strcmp(p->str, "earlycon") == 0)
425 ) {
426 if (p->setup_func(val) != 0)
427 pr_warn("Malformed early option '%s'\n", param);
428 }
429 }
430 /* We accept everything at this stage. */
431 return 0;
432}
433
434void __init parse_early_options(char *cmdline)
435{
436 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
437 do_early_param);
438}
439
440/* Arch code calls this early on, or if not, just before other parsing. */
441void __init parse_early_param(void)
442{
443 static int done __initdata;
444 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
445
446 if (done)
447 return;
448
449 /* All fall through to do_early_param. */
450 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
451 parse_early_options(tmp_cmdline);
452 done = 1;
453}
454
455void __init __weak smp_setup_processor_id(void)
456{
457}
458
459# if THREAD_SIZE >= PAGE_SIZE
460void __init __weak thread_stack_cache_init(void)
461{
462}
463#endif
464
465/*
466 * Set up kernel memory allocators
467 */
468static void __init mm_init(void)
469{
470 /*
471 * page_ext requires contiguous pages,
472 * bigger than MAX_ORDER unless SPARSEMEM.
473 */
474 page_ext_init_flatmem();
475 mem_init();
476#ifdef CONFIG_AMLOGIC_PAGE_TRACE
477 /* allocate memory before first page allocated */
478 page_trace_mem_init();
479#endif
480 kmem_cache_init();
481 percpu_init_late();
482 pgtable_init();
483 vmalloc_init();
484 ioremap_huge_init();
485 kaiser_init();
486}
487
488asmlinkage __visible void __init start_kernel(void)
489{
490 char *command_line;
491 char *after_dashes;
492
493 set_task_stack_end_magic(&init_task);
494 smp_setup_processor_id();
495 debug_objects_early_init();
496
497 /*
498 * Set up the the initial canary ASAP:
499 */
500 boot_init_stack_canary();
501
502 cgroup_init_early();
503
504 local_irq_disable();
505 early_boot_irqs_disabled = true;
506
507/*
508 * Interrupts are still disabled. Do necessary setups, then
509 * enable them
510 */
511 boot_cpu_init();
512 page_address_init();
513 pr_notice("%s", linux_banner);
514 setup_arch(&command_line);
515 mm_init_cpumask(&init_mm);
516 setup_command_line(command_line);
517 setup_nr_cpu_ids();
518 setup_per_cpu_areas();
519 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
520 boot_cpu_hotplug_init();
521
522 build_all_zonelists(NULL, NULL);
523 page_alloc_init();
524
525 pr_notice("Kernel command line: %s\n", boot_command_line);
526 /* parameters may set static keys */
527 jump_label_init();
528 parse_early_param();
529 after_dashes = parse_args("Booting kernel",
530 static_command_line, __start___param,
531 __stop___param - __start___param,
532 -1, -1, NULL, &unknown_bootoption);
533 if (!IS_ERR_OR_NULL(after_dashes))
534 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
535 NULL, set_init_arg);
536
537 /*
538 * These use large bootmem allocations and must precede
539 * kmem_cache_init()
540 */
541 setup_log_buf(0);
542 pidhash_init();
543 vfs_caches_init_early();
544 sort_main_extable();
545 trap_init();
546 mm_init();
547
548 /*
549 * Set up the scheduler prior starting any interrupts (such as the
550 * timer interrupt). Full topology setup happens at smp_init()
551 * time - but meanwhile we still have a functioning scheduler.
552 */
553 sched_init();
554 /*
555 * Disable preemption - early bootup scheduling is extremely
556 * fragile until we cpu_idle() for the first time.
557 */
558 preempt_disable();
559 if (WARN(!irqs_disabled(),
560 "Interrupts were enabled *very* early, fixing it\n"))
561 local_irq_disable();
562 idr_init_cache();
563
564 /*
565 * Allow workqueue creation and work item queueing/cancelling
566 * early. Work item execution depends on kthreads and starts after
567 * workqueue_init().
568 */
569 workqueue_init_early();
570
571 rcu_init();
572
573 /* trace_printk() and trace points may be used after this */
574 trace_init();
575
576 context_tracking_init();
577 radix_tree_init();
578 /* init some links before init_ISA_irqs() */
579 early_irq_init();
580 init_IRQ();
581 tick_init();
582 rcu_init_nohz();
583 init_timers();
584 hrtimers_init();
585 softirq_init();
586 timekeeping_init();
587 time_init();
588 sched_clock_postinit();
589 printk_nmi_init();
590 perf_event_init();
591 profile_init();
592 call_function_init();
593 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
594 early_boot_irqs_disabled = false;
595 local_irq_enable();
596
597 kmem_cache_init_late();
598
599 /*
600 * HACK ALERT! This is early. We're enabling the console before
601 * we've done PCI setups etc, and console_init() must be aware of
602 * this. But we do want output early, in case something goes wrong.
603 */
604 console_init();
605 if (panic_later)
606 panic("Too many boot %s vars at `%s'", panic_later,
607 panic_param);
608
609 lockdep_info();
610
611 /*
612 * Need to run this when irqs are enabled, because it wants
613 * to self-test [hard/soft]-irqs on/off lock inversion bugs
614 * too:
615 */
616 locking_selftest();
617
618#ifdef CONFIG_BLK_DEV_INITRD
619 if (initrd_start && !initrd_below_start_ok &&
620 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
621 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
622 page_to_pfn(virt_to_page((void *)initrd_start)),
623 min_low_pfn);
624 initrd_start = 0;
625 }
626#endif
627 page_ext_init();
628 debug_objects_mem_init();
629 kmemleak_init();
630 setup_per_cpu_pageset();
631 numa_policy_init();
632 if (late_time_init)
633 late_time_init();
634 sched_clock_init();
635 calibrate_delay();
636 pidmap_init();
637 anon_vma_init();
638 acpi_early_init();
639#ifdef CONFIG_X86
640 if (efi_enabled(EFI_RUNTIME_SERVICES))
641 efi_enter_virtual_mode();
642#endif
643#ifdef CONFIG_X86_ESPFIX64
644 /* Should be run before the first non-init thread is created */
645 init_espfix_bsp();
646#endif
647 thread_stack_cache_init();
648 cred_init();
649 fork_init();
650 proc_caches_init();
651 buffer_init();
652 key_init();
653 security_init();
654 dbg_late_init();
655 vfs_caches_init();
656 pagecache_init();
657 signals_init();
658 proc_root_init();
659 nsfs_init();
660 cpuset_init();
661 cgroup_init();
662 taskstats_init_early();
663 delayacct_init();
664
665 check_bugs();
666
667 acpi_subsystem_init();
668 sfi_init_late();
669
670 if (efi_enabled(EFI_RUNTIME_SERVICES)) {
671 efi_late_init();
672 efi_free_boot_services();
673 }
674
675 ftrace_init();
676
677 /* Do the rest non-__init'ed, we're now alive */
678 rest_init();
679}
680
681/* Call all constructor functions linked into the kernel. */
682static void __init do_ctors(void)
683{
684#ifdef CONFIG_CONSTRUCTORS
685 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
686
687 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
688 (*fn)();
689#endif
690}
691
692bool initcall_debug;
693core_param(initcall_debug, initcall_debug, bool, 0644);
694
695#ifdef CONFIG_KALLSYMS
696struct blacklist_entry {
697 struct list_head next;
698 char *buf;
699};
700
701static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
702
703static int __init initcall_blacklist(char *str)
704{
705 char *str_entry;
706 struct blacklist_entry *entry;
707
708 /* str argument is a comma-separated list of functions */
709 do {
710 str_entry = strsep(&str, ",");
711 if (str_entry) {
712 pr_debug("blacklisting initcall %s\n", str_entry);
713 entry = alloc_bootmem(sizeof(*entry));
714 entry->buf = alloc_bootmem(strlen(str_entry) + 1);
715 strcpy(entry->buf, str_entry);
716 list_add(&entry->next, &blacklisted_initcalls);
717 }
718 } while (str_entry);
719
720 return 0;
721}
722
723static bool __init_or_module initcall_blacklisted(initcall_t fn)
724{
725 struct blacklist_entry *entry;
726 char fn_name[KSYM_SYMBOL_LEN];
727 unsigned long addr;
728
729 if (list_empty(&blacklisted_initcalls))
730 return false;
731
732 addr = (unsigned long) dereference_function_descriptor(fn);
733 sprint_symbol_no_offset(fn_name, addr);
734
735 /*
736 * fn will be "function_name [module_name]" where [module_name] is not
737 * displayed for built-in init functions. Strip off the [module_name].
738 */
739 strreplace(fn_name, ' ', '\0');
740
741 list_for_each_entry(entry, &blacklisted_initcalls, next) {
742 if (!strcmp(fn_name, entry->buf)) {
743 pr_debug("initcall %s blacklisted\n", fn_name);
744 return true;
745 }
746 }
747
748 return false;
749}
750#else
751static int __init initcall_blacklist(char *str)
752{
753 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
754 return 0;
755}
756
757static bool __init_or_module initcall_blacklisted(initcall_t fn)
758{
759 return false;
760}
761#endif
762__setup("initcall_blacklist=", initcall_blacklist);
763
764static int __init_or_module do_one_initcall_debug(initcall_t fn)
765{
766 ktime_t calltime, delta, rettime;
767 unsigned long long duration;
768 int ret;
769
770 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
771 calltime = ktime_get();
772 ret = fn();
773 rettime = ktime_get();
774 delta = ktime_sub(rettime, calltime);
775 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
776 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n",
777 fn, ret, duration);
778
779 return ret;
780}
781
782int __init_or_module do_one_initcall(initcall_t fn)
783{
784 int count = preempt_count();
785 int ret;
786 char msgbuf[64];
787
788 if (initcall_blacklisted(fn))
789 return -EPERM;
790
791 if (initcall_debug)
792 ret = do_one_initcall_debug(fn);
793 else
794 ret = fn();
795
796 msgbuf[0] = 0;
797
798 if (preempt_count() != count) {
799 sprintf(msgbuf, "preemption imbalance ");
800 preempt_count_set(count);
801 }
802 if (irqs_disabled()) {
803 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
804 local_irq_enable();
805 }
806 WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
807
808 add_latent_entropy();
809 return ret;
810}
811
812
813extern initcall_t __initcall_start[];
814extern initcall_t __initcall0_start[];
815extern initcall_t __initcall1_start[];
816extern initcall_t __initcall2_start[];
817extern initcall_t __initcall3_start[];
818extern initcall_t __initcall4_start[];
819extern initcall_t __initcall5_start[];
820extern initcall_t __initcall6_start[];
821extern initcall_t __initcall7_start[];
822extern initcall_t __initcall_end[];
823
824static initcall_t *initcall_levels[] __initdata = {
825 __initcall0_start,
826 __initcall1_start,
827 __initcall2_start,
828 __initcall3_start,
829 __initcall4_start,
830 __initcall5_start,
831 __initcall6_start,
832 __initcall7_start,
833 __initcall_end,
834};
835
836/* Keep these in sync with initcalls in include/linux/init.h */
837static char *initcall_level_names[] __initdata = {
838 "early",
839 "core",
840 "postcore",
841 "arch",
842 "subsys",
843 "fs",
844 "device",
845 "late",
846};
847
848static void __init do_initcall_level(int level)
849{
850 initcall_t *fn;
851
852 strcpy(initcall_command_line, saved_command_line);
853 parse_args(initcall_level_names[level],
854 initcall_command_line, __start___param,
855 __stop___param - __start___param,
856 level, level,
857 NULL, &repair_env_string);
858
859 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
860 do_one_initcall(*fn);
861}
862
863static void __init do_initcalls(void)
864{
865 int level;
866
867 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
868 do_initcall_level(level);
869}
870
871/*
872 * Ok, the machine is now initialized. None of the devices
873 * have been touched yet, but the CPU subsystem is up and
874 * running, and memory and process management works.
875 *
876 * Now we can finally start doing some real work..
877 */
878static void __init do_basic_setup(void)
879{
880 cpuset_init_smp();
881 shmem_init();
882 driver_init();
883 init_irq_proc();
884 do_ctors();
885 usermodehelper_enable();
886 do_initcalls();
887}
888
889static void __init do_pre_smp_initcalls(void)
890{
891 initcall_t *fn;
892
893 for (fn = __initcall_start; fn < __initcall0_start; fn++)
894 do_one_initcall(*fn);
895}
896
897/*
898 * This function requests modules which should be loaded by default and is
899 * called twice right after initrd is mounted and right before init is
900 * exec'd. If such modules are on either initrd or rootfs, they will be
901 * loaded before control is passed to userland.
902 */
903void __init load_default_modules(void)
904{
905 load_default_elevator_module();
906}
907
908static int run_init_process(const char *init_filename)
909{
910 argv_init[0] = init_filename;
911 return do_execve(getname_kernel(init_filename),
912 (const char __user *const __user *)argv_init,
913 (const char __user *const __user *)envp_init);
914}
915
916static int try_to_run_init_process(const char *init_filename)
917{
918 int ret;
919
920 ret = run_init_process(init_filename);
921
922 if (ret && ret != -ENOENT) {
923 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
924 init_filename, ret);
925 }
926
927 return ret;
928}
929
930static noinline void __init kernel_init_freeable(void);
931
932#if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX)
933bool rodata_enabled __ro_after_init = true;
934static int __init set_debug_rodata(char *str)
935{
936 return strtobool(str, &rodata_enabled);
937}
938__setup("rodata=", set_debug_rodata);
939#endif
940
941#ifdef CONFIG_DEBUG_RODATA
942static void mark_readonly(void)
943{
944 if (rodata_enabled)
945 mark_rodata_ro();
946 else
947 pr_info("Kernel memory protection disabled.\n");
948}
949#else
950static inline void mark_readonly(void)
951{
952 pr_warn("This architecture does not have kernel memory protection.\n");
953}
954#endif
955
956static int __ref kernel_init(void *unused)
957{
958 int ret;
959
960 kernel_init_freeable();
961 /* need to finish all async __init code before freeing the memory */
962 async_synchronize_full();
963 free_initmem();
964 mark_readonly();
965 system_state = SYSTEM_RUNNING;
966 numa_default_policy();
967
968 rcu_end_inkernel_boot();
969
970 if (ramdisk_execute_command) {
971 ret = run_init_process(ramdisk_execute_command);
972 if (!ret)
973 return 0;
974 pr_err("Failed to execute %s (error %d)\n",
975 ramdisk_execute_command, ret);
976 }
977
978 /*
979 * We try each of these until one succeeds.
980 *
981 * The Bourne shell can be used instead of init if we are
982 * trying to recover a really broken machine.
983 */
984 if (execute_command) {
985 ret = run_init_process(execute_command);
986 if (!ret)
987 return 0;
988 panic("Requested init %s failed (error %d).",
989 execute_command, ret);
990 }
991 if (!try_to_run_init_process("/sbin/init") ||
992 !try_to_run_init_process("/etc/init") ||
993 !try_to_run_init_process("/bin/init") ||
994 !try_to_run_init_process("/bin/sh"))
995 return 0;
996
997 panic("No working init found. Try passing init= option to kernel. "
998 "See Linux Documentation/init.txt for guidance.");
999}
1000
1001static noinline void __init kernel_init_freeable(void)
1002{
1003 /*
1004 * Wait until kthreadd is all set-up.
1005 */
1006 wait_for_completion(&kthreadd_done);
1007
1008 /* Now the scheduler is fully set up and can do blocking allocations */
1009 gfp_allowed_mask = __GFP_BITS_MASK;
1010
1011 /*
1012 * init can allocate pages on any node
1013 */
1014 set_mems_allowed(node_states[N_MEMORY]);
1015 /*
1016 * init can run on any cpu.
1017 */
1018 set_cpus_allowed_ptr(current, cpu_all_mask);
1019
1020 cad_pid = task_pid(current);
1021
1022 smp_prepare_cpus(setup_max_cpus);
1023
1024 workqueue_init();
1025
1026 do_pre_smp_initcalls();
1027 lockup_detector_init();
1028
1029 smp_init();
1030 sched_init_smp();
1031
1032 page_alloc_init_late();
1033
1034 do_basic_setup();
1035
1036 /* Open the /dev/console on the rootfs, this should never fail */
1037 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
1038 pr_err("Warning: unable to open an initial console.\n");
1039
1040 (void) sys_dup(0);
1041 (void) sys_dup(0);
1042 /*
1043 * check if there is an early userspace init. If yes, let it do all
1044 * the work
1045 */
1046
1047 if (!ramdisk_execute_command)
1048 ramdisk_execute_command = "/init";
1049
1050 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
1051 ramdisk_execute_command = NULL;
1052 prepare_namespace();
1053 }
1054
1055 /*
1056 * Ok, we have completed the initial bootup, and
1057 * we're essentially up and running. Get rid of the
1058 * initmem segments and start the user-mode stuff..
1059 *
1060 * rootfs is available now, try loading the public keys
1061 * and default modules
1062 */
1063
1064 integrity_load_keys();
1065 load_default_modules();
1066}
1067
generated by cgit at 2024-05-18 12:52:42 (GMT)